MPI_Cart_rank(3) MPI MPI_Cart_rank(3)NAMEMPI_Cart_rank - Determines process rank in communicator given Carte‐
sian location
SYNOPSIS
int MPI_Cart_rank(MPI_Comm comm, MPICH2_CONST int *coords, int *rank)
INPUT PARAMETERS
comm - communicator with cartesian structure (handle)
coords - integer array (of size ndims , the number of dimensions of the
Cartesian topology associated with comm ) specifying the carte‐
sian coordinates of a process
OUTPUT PARAMETER
rank - rank of specified process (integer)
NOTES
Out-of-range coordinates are erroneous for non-periodic dimensions.
Versions of MPICH before 1.2.2 returned MPI_PROC_NULL for the rank in
this case.
THREAD AND INTERRUPT SAFETY
This routine is both thread- and interrupt-safe. This means that this
routine may safely be used by multiple threads and from within a signal
handler.
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
an additional argument ierr at the end of the argument list. ierr is
an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with
the call statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
Fortran.
ERRORS
All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error
value; C routines as the value of the function and Fortran routines in
the last argument. Before the value is returned, the current MPI error
handler is called. By default, this error handler aborts the MPI job.
The error handler may be changed with MPI_Comm_set_errhandler (for com‐
municators), MPI_File_set_errhandler (for files), and
MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine
MPI_Errhandler_set may be used but its use is deprecated. The prede‐
fined error handler MPI_ERRORS_RETURN may be used to cause error values
to be returned. Note that MPI does not guarentee that an MPI program
can continue past an error; however, MPI implementations will attempt
to continue whenever possible.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_TOPOLOGY
- Invalid topology. Either there is no topology associated with
this communicator, or it is not the correct type (e.g., MPI_CART
when expecting MPI_GRAPH ).
MPI_ERR_RANK
- Invalid source or destination rank. Ranks must be between
zero and the size of the communicator minus one; ranks in a
receive ( MPI_Recv , MPI_Irecv , MPI_Sendrecv , etc.) may also
be MPI_ANY_SOURCE .
MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not identi‐
fied by a specific error class (e.g., MPI_ERR_RANK ).
LOCATION
src/mpi/topo/cart_rank.c
9/20/2012 MPI_Cart_rank(3)
